Held at gun point by Telkom

I had my ADSL contract for over 24 months , the router got damaged and I went to Telkom in Cresta to request a replacement router. They said because my contract is over 24 months and they cannot replace the router.The lady suggested that, I either have to renew my contract or pay for a new router. I then requested them to cancel my contract rather. The lady at the counter said she cannot cancel my contract I have to call the call centre to cancel . I called the call centre in the store and I was holding for over 45 mins , I decided to drop the call and informed the lady that I am holding on to long. She gave me the number to call again later. I called the Monday at work and was holding just as long. Thursday I went to Telkom in Southgate and tried calling again, no response. I had enough by then that nobody can assist me to cancel this contact. I told the lady they will have to call me now. The only call I received was 4 months later from lawyers and I explained to the gentleman and he said he will refer my case to Telkom. I am now being called by MM Capital and this is not fair. I tried on numerous occasions to cancel this contract and now Ii have to pay . Please Help!